diff options
| author | Nico Huber <nico.huber@secunet.com> | 2017-08-01 17:09:35 +0200 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2017-08-18 15:33:45 +0000 |
| commit | 581738642fbeacdf97fc737a41b3128d72cf1a1c (patch) | |
| tree | 8f40edb039a66fb6ccdc29b88f7e3b007b048e82 /src/soc/intel/common/block/i2c/lpss_i2c.c | |
| parent | 0f2dd1eff9930e30dddd9aabceb5d85ee3b4e980 (diff) | |
Reinvent I2C ops
Do not use the global platform_i2c_transfer() function that can only be
implemented by a single driver. Instead, make a `struct device` aware
transfer() function the only interface function for I2C controller dri-
vers to implement.
To not force the slave device drivers to be implemented either above
generic I2C or specialized SMBus operations, we support SMBus control-
lers in the slave device interface too.
We start with four simple slave functions: i2c_readb(), i2c_writeb(),
i2c_readb_at() and i2c_writeb_at(). They are all compatible to respec-
tive SMBus functions. But we keep aliases because it would be weird to
force e.g. an I2C EEPROM driver to call smbus_read_byte().
Change-Id: I98386f91bf4799ba3df84ec8bc0f64edd4142818
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/20846
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Diffstat (limited to 'src/soc/intel/common/block/i2c/lpss_i2c.c')
| -rw-r--r-- | src/soc/intel/common/block/i2c/lpss_i2c.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/src/soc/intel/common/block/i2c/lpss_i2c.c b/src/soc/intel/common/block/i2c/lpss_i2c.c index 868a6ad300..7db3fe9668 100644 --- a/src/soc/intel/common/block/i2c/lpss_i2c.c +++ b/src/soc/intel/common/block/i2c/lpss_i2c.c @@ -258,7 +258,7 @@ static int lpss_i2c_wait_for_bus_idle(struct lpss_i2c_regs *regs) /* Transfer one byte of one segment, sending stop bit if requested */ static int lpss_i2c_transfer_byte(struct lpss_i2c_regs *regs, - struct i2c_msg *segment, + const struct i2c_msg *segment, size_t byte, int send_stop) { struct stopwatch sw; @@ -297,16 +297,15 @@ static int lpss_i2c_transfer_byte(struct lpss_i2c_regs *regs, return 0; } -/* Global I2C bus handler, defined in include/i2c.h */ -int platform_i2c_transfer(unsigned int bus, struct i2c_msg *segments, - int count) +int lpss_i2c_transfer(unsigned int bus, + const struct i2c_msg *segments, size_t count) { struct stopwatch sw; struct lpss_i2c_regs *regs; size_t byte; int ret = -1; - if (count <= 0 || !segments) + if (count == 0 || !segments) return -1; regs = (struct lpss_i2c_regs *)lpss_i2c_base_address(bus); @@ -396,6 +395,12 @@ out: return ret; } +/* Global I2C bus handler, defined in include/device/i2c_simple.h */ +int platform_i2c_transfer(unsigned int bus, struct i2c_msg *msg, int count) +{ + return lpss_i2c_transfer(bus, msg, count < 0 ? 0 : count); +} + static int lpss_i2c_set_speed_config(unsigned int bus, const struct lpss_i2c_speed_config *config) { |